Crystal morphology of zircon in Precambrian gneiss complex and Mesozoic plutonic rocks from the Hamyang-Geochang area, South Korea.

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Crystal forms of zircon in granitoids have been measured to investigate the conditions of metamorphism and igneous activity. The Precambrian Sobaegsan and the Jirisan gneiss complexes contains various zircons from the {110}>{100} to {100} prism types, probably due to the early progressive and the later retrogressive metamorphism. The Jurassic gneissose granodiorite shows the "fan-shaped" PPEF diagrams of the {110}={100} zircon, which suggest magma at moderate temperatures in the middle stages of crystallization differentiation. The Jurassic Geochang granodiorite forms the "scissor-shaped" PPEF diagrams of the middle-prismatic {110}>{100} and the short-prismatic {110}<{100}zircons, suggesting the assimilation or contamination at low temperatures in the later stages. The Jurassic to Cretaceous intermediate and basic plutonic rocks is characterized by the "bundle-shaped" diagrams of the {100} zircon, showing that new igneous activity of high temperatures started. The Cretaceous Gajo granite forms the "scissor-shaped" PPEF diagrams of the {110}>{100} and the {110}<{100} zircons, probably resulted from the assimilation or contamination at low temperatures in the later stages.
日本鉱物科学会の論文